Philip bourne



PATENTED SEPT. 20, 1904 P. BOURNE. AUTOMATIG'DOOR ALARM.

- APPLICATION FILED SEPT. a. 1903.

N0 MODEL.

A TTOHNE Y8 Patented September 20, 1904.

PATENT OFEIcE.

PHILIP BOURNE, OF NEW YORK, N. Y.

AUTOMATIC DOOR-ALARM.

SPECIFICATION forming part of Letters Patent No. 770,555, dated September 20, 1904.

Application filed September 8, 1903. Serial No. 172,286. (No model.)

To all whom it may concern.-

Be it known that I, PHILIP BOURNE, a citizen of the United States, and a resident of the city of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Automatic Door-Alarm, of which the following is a full, clear, and exact description.

The purpose of my invention is to provide an alarm attachment for doors brought into operation by the slightest turn of a door-knob with which the device is connected and which device may be expeditiously carried from and locked out of action Whenever desired.

A further purpose of the invention is to provide a simple, durable, and economic construction of a door-alarm capable of ready application to any door and in which springs or their equivalents are not employed for actuating the hammer of the alarm, but wherein instead the chain of gearing set in motion by the turning of the knob-spindle actuates arevolubly-mounted member carrying a plurality of loosely-mounted hammers, which acting rapidly on the gong as said member is revolved produce an incessant or uninterrupted alarm during the entire time the knob is turned, ceasing when the knob'is released.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in both figures. 7

Figure 1 is an inner face view of a portion of a door and a front elevation of the applied device, the gong being removed and the knob-spindle of the lock appearing in section; and Fig. 2 is a horizontal section through the device, a portion of the door and its lock appearing in plan view.

A represents a door, and B the lock for the door provided with the usual knob-spindle b. on which the knob b is secured, and to the neck 6 of the knob a clamp 10 is fastened, preferably in a detachable manner. The said clamp is connected in any suitable or approved The springs when in their normal position serve to hold the knob-spindle t in such position as to admit of the-latch-head of the lock occupying its normally outer position, (shown in Fig. 2,) and when the knobspindle is turned either to the right or to the left one of the springs will be placed under tension and the other spring will be relaxed and will yield. As soon as the knob of the lock is released the spring placed under tension will draw the knob-spindle to its normal position and both springs will be straightened, occupying the position shown in Fig. 3.

In order that the springs shall act without failure in the manner described, said springs are wound closely at their end portions; but their center portions are openly coiled, so that the central portions of the springs out of action will bow outward while the opposing spring is placed under regular tension.

An auxiliary frame D is employed in connection with the supporting-frame O. This auxiliary frame D consists of a circular member 14, a vertically-disposed centrally-located member 15, an upper lug 16, which is pivotally attached by a screw 17 or otherwise to the supporting-frame C, and a lower handle 18, which-extends from the circular member 14:, as'is shown in Fig. 1. This handle member 18 is provided with a transverse slot 19, through which the stem of a set-screw 20 is passed into a suitably-threaded aperture in the supporting-frame C. Thus by loosening the set-screw 20 the auxiliary frame D may be moved to or from the lock B, as may be found desirable.

A stud 21 is secured to the central member 15 of the auxiliary frame at its central portion, and the said stud is threaded at its outer end to detachably receive a gong 22. A disk 23 is loosely mounted on the said stem 21, and this disk 23 is provided with-an attached pinion 24, which meshes with a gear 25, car

rying a pinion 26, the gear revolving on a suitable postsecured to the aforesaid member of the auxiliary frame. The pinion 26 is adapted to mesh with a gear 27, carrying a pinion 28, and the post carrying the gear 27 and pinion 28 is secured to an offset 28 from the transverse member 15 of the auxiliary frame. This pinion 28 engages with a large gear 29, also mounted to turn on the offset 28 above mentioned, and to this gear 29 a smaller gear 30 is attached, and this smaller gear 30 mesheswith the teeth 12 of the sector 11. This series of gearingis adapted to multiply the revolution of the disk 23, making the said disk turn very rapidly upon an exceedingly slight movement of the sector. will be understood that this chain of gearing may be increased or modified as may be found desirable.

The disk 23 carries a series of hammers 31, each of the hammers being integral with a shank 32, engaging with the disk 23, and the shank of each hammer is provided with an elongated slot 33, through which slots pins 34 are loosely passed into the said disk, the said pins being concentrically located with respect to the center of the disk. The movements of the hammers are limited by pins 35, which are securely fastened to the said disk. Thus when the knob-spindle is turned to the slightest extent the disk 23'is made to revolve very rapidly, and the hammers, which are pendulum mounted and have also sliding movement, strike the gong 22 one after the other in rapid succession, thus providing an uninterrupted alarm while the knob is turned one way or the other.

In order to insure the hammers 31 being brought into action in proper striking engagement with the gong, lugs 31 are made integral with the inner face of the gong. These lugs are ordinarily four in number, but a greater or less number may be employed. When the lugs 31 are used, the shanks of the hammers can be made quite short and the action of the hammers is rendered positive.

When it is desired to place the alarm out of action,the set-screw is loosened and the auxiliary frame D is carried away from the sector 11 to such an extent as to separate the teeth of the sector from the teeth of the gear but when it is desired to open the door from the inside without sounding an alarm the set-screw is loosened, so that the gong can be pushed to one-side, and as soon as the gong is released a light spring 40, attached to the handle 18 of the gong and to an adjacent post on the frame C, will immediately draw the gong-frame to its normal position. In fact, when the spring 40 is used the set-screw 20 can be left loose.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination of a knob. a gong, gongringing connections between said knob and gong, the gong being normally held in operative relation to said knob, means for moving said gong manually out of operative relation to said knob and locking itin said inoperative position, and means for automatically returning the gong to its normal operative relation to the knob, when it has been released.

2. The combination of a rotatable knob, gong-ringing mechanism actuated by the rotation of said knob, a gong freely moved back and forthinto or out of operative connections with said ringing mechanism, and means for normally holding the gong in operative connection with said mechanism, and automatically returning it to its normal position when it has been moved therefrom.

3. In an alarm device, a sector adapted for attachment to a knob orknob-spindle, a frame mounted for movement to and from the sector, a member mounted to revolve in the said frame, a chain of gearing carried by the frame, and arranged to actuate the said revolving member and adapt it for engagement withthe said sector, a gong carried by the frame, and a series of hammers pivotally and slidably mounted on the revolving member for engagement with the gong, as described.

4:. The combination with a knob, a toothed sector secured to the knob, a supporting frame adapted for attachment to a door, and

springs connected with the ends of the sector and the top and bottom of the supportingframe, of an auxiliary frame pivotally mounted on the supporting-frame, a locking device for the auxiliary frame, a train of gearing carried by the auxiliary frame, adapted to be actuated by the said sector, a disk mounted to revolve in the auxiliary frame, means for actuating the said disk by the said chain of gearing, a gong carried by the auxiliaryframe and located over the disk, and a plurality of hammers slidably and pivotally mounted on the said disk, and arranged as the disk rotates to engage with the said gong and thereby sound an alarm, as described.

5. In an alarm device, the combination with a knob and mechanism actuated thereby, of a movable gong and gong-ringing mechanism carried thereby, and adapted to be operated by said knob-controlled mechanism to ring the gong, the gong-ringing mechanism being normally held in engagement with the knob-controlled mechanism, a handle for moving the gong and the mechanism carried thereby out of engagement with the knob-actuated mechanism, and a spring for automatically return ing the gong and its ringing mechanism into engagement with the knob-controlled mechanism.

6. The combination with a knob-spindle,

and a member carried by the spindle to rotate "pressed.

' 7. The combination with a knob, and gongringing mechanism actuated thereby, of a gong adapted to be rung by said mechanism, said gong being mounted to swing into or out of operative relation to said knob, a spring for returning said gong into operative relation to said knob after it has been moved into inoperative relation thereto, and a thumbscreW for securing said gong in either position desired.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

PHILIP BOURNE.

Witnesses J. FRED AoKER, JNo. M. RITTER. 

